Hi I use to get blue screen error and I am damn sure that it is because of motherboard but I showed it to mechanic,he tinkered with the motherboard and the error was gone but after a month it again shows up
Can anyone tell me what the mechanic could possibly have done?

Mainly is the blue screen of death causes due to device problems like hard disk physical dump memory..............
Blue Screen errors (Also known as bug checks)occur when the system encounters a condition that compromises safe operations.
A software program can cause Blue Screen, If you just installed anything new, try uninstalling. Or use last known good configuration when booting.